Field Evaluation of Three Methods for Monitoring Populations of House Flies (Musca domestica) (Diptera: Muscidae) and Other Filth Flies in Three Types of Poultry Housing Systems

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Abstract
Analysis of field data collected over several years in three poultry housing systems (narrow caged-layer houses. high-rise caged-layer houses. and broiler-breeder layer houses) indicated that the baited jug-trap was a reliable method of sampling house flies. Musca domestica L.; sticky ribbons provided additional information on two other fly species. Relative frequency of house fly capture indicated that this fly was present in all poultry systems in North Carolina from May to October. while Fannia canicularis (L.) and Ophyra spp. were present in low numbers after July. Sticky ribbon indices were correlated with baited jug-trap indices for all three fly species in all poultry systems. Spot card indices were correlated with house fly abundance indices, but appeared to be influenced by other fly species in narrow and high-rise caged-layer houses. The relationship between the mean and variance of house fly abundance indices was used to determine the number of samples required to obtain estimates of house fly abundance with a fixed level of precision (CV = 0.10, 0.15, and 0.20) in each poultry housing system.